Auto merge of rust-lang#259 - nodakai:patch-1, r=alexcrichton

Explain about the automated tests on Travis

in order to advise contributors to locally test their patches.

Author: bors

README.md

@@ -88,6 +88,16 @@ With that in mind, the steps for adding a new API are:
 4. Wait for CI to pass, fixing errors.
 5. Wait for a merge!
 
+### Test before you commit
+
+We have two automated tests running on [Travis](https://travis-ci.org/rust-lang/libc):
+
+1. [`libc-test`](https://github.com/alexcrichton/ctest)
+  - `cd libc-test && cargo run`
+  - Use the `skip_*()` functions in `build.rs` if you really need a workaround.
+2. Style checker
+  - `rustc ci/style.rs && ./style src`
+
 ## Platforms and Documentation
 
 The following platforms are currently tested and have documentation available: